Options: Asura Kaiser, Mr. Invincible
Review: The Nova Grapplers are not a lackluster clan. The difficulty involved with them is their lack of cards rather than the utility or power behind any particular unit. For a Grappler cardfighter, the main problem is being overwhelmed by extremely good cards that nonetheless have no place in their particular build.
This is evident right from their debut set, where Asura Kaiser introduces himself as an unrelenting stand engine. Although his primary skill is only active in the vanguard circle, the army backing Kaiser's title is his 11000 power. Because in vanguard, only units of greater than or equal to power than their target can successfully retire or damage a given unit on attack, this 11000 power makes the Kaiser virtually invincible in straightforward battle. If the opponent calls a boosting unit to help retire a rearguard Kaiser, then the opponent has just used two units to eliminate 1--wearing their hand down. Furthermore, 11000-power units have an inherent advantage in every circle concerning how easy it is to shield them from attacks. If a 20000-power column attacks the Kaiser, it takes a single critical trigger or especial intercept from NGM Prototype to block their attack, versus the critical and draw that 10000-power vanguards require. This protects the hand and firmly cements Kaiser as the throne of the Nova Grapplers.
Unlike with some other clans, both of these cards have an immediate use in the vanguard and rearguard. Their skills combo well--using Kaiser's skill to stand an Invincible that has already attacked is only going to give the opponent their worst day--and their disadvantages are tuned just so that a pure Nova fighter won't even need to consider them. It's more of a challenge to find a Nova deck that these two can't bring a strong image to.